/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 */
package org.apache.bookkeeper.client;

import com.google.common.util.concurrent.ListenableFuture;

/**
 * Define an executor for issuing speculative requests.
 *
 * <p>If the implementation can issue a speculative read, it should return true
 * to indicate a speculative request should be issued. Otherwise, return false.
 *
 * @since 4.5
 */
public interface SpeculativeRequestExecutor {

    /**
     * Issues a speculative request and indicates if more speculative
     * requests should be issued.
     *
     * @return whether more speculative requests should be issued
     */
    ListenableFuture<Boolean> issueSpeculativeRequest();
}
